With a thousand points, you barely notice the delay. With a million, you're doing a million distance calculations for every single query. On a phone updating the map as the user scrolls, that's untenable.
第19届肖邦国际钢琴比赛结束后，陆逸轩压轴登台连续三晚的庆典音乐会。图丨 © Krzysztof Szlezak
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